摘要
通过三轴试验,本文针对邓肯—张模型对砂卵石土的适用性进行了分析研究。试验结果表明,砂卵石土的体变在经历初始的体缩段后,随着轴向应变增加变为以体胀为主,并且随着围压增大,体胀逐渐减弱;砂卵石土的强度和切线弹性模量可以根据邓肯—张模型来较合理地确定;邓肯—张模型不能够较好地描述砂卵石土的体变特性与泊松比参数,切线泊松比应优选本文所拟合公式。
Through triaxial test,the study on the applicability of Duncan-Chang Model for sandy pebble soil is carried out in this paper.The test results show that sandy pebble soil appears volumetric reduction in the initial test,but with the increase of axial strain the soil sample changes into volume expansion mainly.And the volume expansion is gradually weakened with the increase of confining pressure.The strength and tangent elastic modulus of sandy pebble soil can reasonably determine based on Duncan-Zhang Model.Duncan-Chang model can not be used to describe the volumetric strain characteristics and Poisson＇s ratio parameters,and the tangent Poisson＇s ratio should prefer to use the fit formula given in this paper.
出处
《建筑科学》
北大核心
2010年第7期1-4,共4页
Building Science
关键词
砂卵石土
邓肯—张模型
三轴试验
弹性模量
泊松比
sandy pebble soil
Duncan-Zhang model
triaxial test
elastic modulus
Poisson＇s ratio
